<?hh // strict
/**
 * Copyright (c) 2014, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the "hack" directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 */

abstract class C {
  public async function gen(): Awaitable<void> {}

  public function f(): void {
    foreach (array() as $_) {
    }
    $this->gen();
  }
}
